siemens: eeprom: simplify setup & read
Since we have boards using the driver model or not for i2c, use abstraction
function to probe the i2c, check the EEPROM and read from EEPROM.
Signed-off-by: Enrico Leto <enrico.leto@siemens.com>
diff --git a/board/siemens/common/eeprom.c b/board/siemens/common/eeprom.c
new file mode 100644
index 0000000..fc93df9
--- /dev/null
+++ b/board/siemens/common/eeprom.c
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *
+ * Read EEPROM data
+ * (C) Copyright 2024 Siemens AG
+ */
+
+#include <dm/uclass.h>
+#include <i2c.h>
+#include "eeprom.h"
+
+#if CONFIG_IS_ENABLED(DM_I2C)
+static struct udevice *i2c_dev;
+#endif
+
+/* Probe I2C and set-up EEPROM */
+int siemens_ee_setup(void)
+{
+#if CONFIG_IS_ENABLED(DM_I2C)
+ struct udevice *bus;
+ int ret;
+
+ ret = uclass_get_device_by_seq(UCLASS_I2C, SIEMENS_EE_I2C_BUS, &bus);
+ if (ret)
+ goto err;
+
+ ret = dm_i2c_probe(bus, SIEMENS_EE_I2C_ADDR, 0, &i2c_dev);
+ if (ret)
+ goto err;
+ if (i2c_set_chip_offset_len(i2c_dev, 2))
+ goto err;
+#else
+ i2c_set_bus_num(SIEMENS_EE_I2C_BUS);
+ if (i2c_probe(SIEMENS_EE_I2C_ADDR))
+ goto err;
+#endif
+ return 0;
+
+err:
+ printf("Could not probe the EEPROM; something fundamentally wrong on the I2C bus.\n");
+ return 1;
+}
+
+/* Read data from EEPROM */
+int siemens_ee_read_data(uint address, uchar *buffer, int len)
+{
+#if CONFIG_IS_ENABLED(DM_I2C)
+ return dm_i2c_read(i2c_dev, address, buffer, len);
+#else
+ return i2c_read(SIEMENS_EE_I2C_ADDR, address, 2, buffer, len);
+#endif
+}